smesh/doc/salome/examples/prism_3d_algo.py
2014-11-07 16:51:28 +03:00

79 lines
2.5 KiB
Python

# Use 3D extrusion meshing algorithm
import salome
salome.salome_init()
from salome.geom import geomBuilder
geompy = geomBuilder.New(salome.myStudy)
import SMESH
from salome.smesh import smeshBuilder
smesh = smeshBuilder.New(salome.myStudy)
OX = geompy.MakeVectorDXDYDZ(1,0,0)
OY = geompy.MakeVectorDXDYDZ(0,1,0)
OZ = geompy.MakeVectorDXDYDZ(0,0,1)
# Y ^ Make geometry of a "pipe" with the following base (cross section).
# | Big central quadrangles will be meshed with triangles, walls
# of the pipe will be meshed with quadrilaterals
# +--+--+--+--+--+--+
# | | | | | | |
# +--+--+--+--+--+--+
# | | | | |
# +--+ | +--+
# | | | | |
# +--+-----+-----+--+
# | | | | |
# +--+ | +--+
# | | | | |
# +--+--+--+--+--+--+
# | | | | | | | -->
# +--+--+--+--+--+--+ X
quadBig = geompy.MakeFaceHW( 20,20, 1 )
quadBig = geompy.MakeTranslation( quadBig, 15,15,0 )
quadSmall = geompy.MakeFaceHW( 10,10, 1 )
smallQuads1 = geompy.MakeMultiTranslation1D( quadSmall, OX, 10, 3 )
smallQuads2 = geompy.MakeMultiTranslation1D( quadSmall, OY, 10, 3 )
smallQuads2 = geompy.SubShapeAllSortedCentres( smallQuads2, geompy.ShapeType["FACE"])[1:]
base = geompy.MakeCompound( smallQuads2 + [smallQuads1, quadBig])
axis = geompy.MakeLine( geompy.MakeVertex( 25,25,0), OZ )
base = geompy.MultiRotate1DNbTimes( base, axis, 4)
base = geompy.MakePartition( [base], theName="base")
path = geompy.MakeSketcher("Sketcher:F 0 0:TT 0 100:R 0:C -90 180:T 0 -150",[0,0,0, 0,-1,0, 1,0,0])
# Make the pipe, each quadrangle of the base turns into a prism with composite wall faces
pipe = geompy.MakePipe( base, path )
prisms = geompy.MakePartition( [pipe], theName="prisms")
# get base faces of the prism to define sub-mesh on them
smallQuad = geompy.GetFaceNearPoint( prisms, geompy.MakeVertex( 0,0,0 ), "smallQuad")
bigQuad = geompy.GetFaceNearPoint( prisms, geompy.MakeVertex( 15,15,0 ), "bigQuad")
mesh = smesh.Mesh( prisms )
# assign Global hypotheses
# 1D algorithm and hypothesis for vertical division
mesh.Segment().NumberOfSegments(15)
# Extrusion 3D algo
mesh.Prism()
# assign Local hypotheses
# 1D and 2D algos and hyps to mesh smallQuad with quadrilaterals
mesh.Segment(smallQuad).LocalLength( 3 )
mesh.Quadrangle(smallQuad)
# 1D and 2D algos and hyps to mesh bigQuad with triangles
mesh.Segment(bigQuad).LocalLength( 3 )
mesh.Triangle(bigQuad)
# compute the mesh
mesh.Compute()